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/* |
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connection.C -- manage a single connection |
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Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <cassert> |
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|
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#include <list> |
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|
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#include <openssl/rand.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include <openssl/err.h> |
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|
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#include "gettext.h" |
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|
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#include "conf.h" |
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#include "slog.h" |
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#include "device.h" |
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#include "vpn.h" |
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#include "connection.h" |
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|
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#include "netcompat.h" |
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|
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#if !HAVE_RAND_PSEUDO_BYTES |
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# define RAND_pseudo_bytes RAND_bytes |
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#endif |
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|
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#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
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|
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#define ULTRA_FAST 1 |
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#define HLOG 15 |
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#include "lzf/lzf.h" |
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#include "lzf/lzf_c.c" |
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#include "lzf/lzf_d.c" |
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|
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struct crypto_ctx |
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{ |
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EVP_CIPHER_CTX cctx; |
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HMAC_CTX hctx; |
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|
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crypto_ctx (const rsachallenge &challenge, int enc); |
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~crypto_ctx (); |
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}; |
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|
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crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
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{ |
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EVP_CIPHER_CTX_init (&cctx); |
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require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
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HMAC_CTX_init (&hctx); |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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} |
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|
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crypto_ctx::~crypto_ctx () |
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{ |
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require (EVP_CIPHER_CTX_cleanup (&cctx)); |
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HMAC_CTX_cleanup (&hctx); |
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} |
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|
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static void |
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rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
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{ |
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EVP_MD_CTX ctx; |
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|
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EVP_MD_CTX_init (&ctx); |
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require (EVP_DigestInit (&ctx, RSA_HASH)); |
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require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
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require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
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require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
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EVP_MD_CTX_cleanup (&ctx); |
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} |
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|
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struct rsa_entry { |
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tstamp expire; |
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rsaid id; |
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rsachallenge chg; |
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}; |
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|
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struct rsa_cache : list<rsa_entry> |
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{ |
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void cleaner_cb (time_watcher &w); time_watcher cleaner; |
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|
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bool find (const rsaid &id, rsachallenge &chg) |
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{ |
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for (iterator i = begin (); i != end (); ++i) |
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{ |
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if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
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{ |
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memcpy (&chg, &i->chg, sizeof chg); |
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|
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erase (i); |
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return true; |
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} |
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} |
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|
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if (cleaner.at < NOW) |
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cleaner.start (NOW + RSA_TTL); |
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|
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return false; |
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} |
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|
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void gen (rsaid &id, rsachallenge &chg) |
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{ |
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rsa_entry e; |
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|
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RAND_bytes ((unsigned char *)&id, sizeof id); |
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RAND_bytes ((unsigned char *)&chg, sizeof chg); |
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|
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e.expire = NOW + RSA_TTL; |
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e.id = id; |
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memcpy (&e.chg, &chg, sizeof chg); |
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|
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push_back (e); |
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|
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if (cleaner.at < NOW) |
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cleaner.start (NOW + RSA_TTL); |
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} |
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|
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rsa_cache () |
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: cleaner (this, &rsa_cache::cleaner_cb) |
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{ } |
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|
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} rsa_cache; |
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|
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void rsa_cache::cleaner_cb (time_watcher &w) |
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{ |
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if (!empty ()) |
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{ |
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w.start (NOW + RSA_TTL); |
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|
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for (iterator i = begin (); i != end (); ) |
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if (i->expire <= NOW) |
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i = erase (i); |
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else |
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++i; |
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} |
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} |
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|
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////////////////////////////////////////////////////////////////////////////// |
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|
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void pkt_queue::put (net_packet *p) |
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{ |
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if (queue[i]) |
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{ |
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delete queue[i]; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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|
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queue[i] = p; |
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|
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i = (i + 1) % QUEUEDEPTH; |
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} |
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|
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net_packet *pkt_queue::get () |
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{ |
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net_packet *p = queue[j]; |
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|
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if (p) |
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{ |
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queue[j] = 0; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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|
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return p; |
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} |
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|
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pkt_queue::pkt_queue () |
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{ |
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memset (queue, 0, sizeof (queue)); |
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i = 0; |
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j = 0; |
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} |
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|
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pkt_queue::~pkt_queue () |
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{ |
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for (i = QUEUEDEPTH; --i > 0; ) |
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delete queue[i]; |
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} |
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|
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struct net_rateinfo { |
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u32 host; |
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double pcnt, diff; |
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tstamp last; |
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}; |
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|
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// only do action once every x seconds per host whole allowing bursts. |
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// this implementation ("splay list" ;) is inefficient, |
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// but low on resources. |
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struct net_rate_limiter : list<net_rateinfo> |
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{ |
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# define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
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# define NRL_CUTOFF 10. // one event every CUTOFF seconds |
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# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
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# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
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|
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bool can (const sockinfo &si) { return can((u32)si.host); } |
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bool can (u32 host); |
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}; |
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|
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net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
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|
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bool net_rate_limiter::can (u32 host) |
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{ |
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iterator i; |
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|
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for (i = begin (); i != end (); ) |
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if (i->host == host) |
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break; |
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else if (i->last < NOW - NRL_EXPIRE) |
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i = erase (i); |
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else |
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i++; |
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|
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if (i == end ()) |
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{ |
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net_rateinfo ri; |
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|
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ri.host = host; |
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ri.pcnt = 1.; |
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ri.diff = NRL_MAXDIF; |
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ri.last = NOW; |
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|
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push_front (ri); |
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|
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return true; |
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} |
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else |
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{ |
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net_rateinfo ri (*i); |
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erase (i); |
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|
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ri.pcnt = ri.pcnt * NRL_ALPHA; |
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ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
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|
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ri.last = NOW; |
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|
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double dif = ri.diff / ri.pcnt; |
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|
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bool send = dif > NRL_CUTOFF; |
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|
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if (dif > NRL_MAXDIF) |
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{ |
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ri.pcnt = 1.; |
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ri.diff = NRL_MAXDIF; |
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} |
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else if (send) |
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ri.pcnt++; |
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|
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push_front (ri); |
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|
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return send; |
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} |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
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|
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void hmac_packet::hmac_gen (crypto_ctx *ctx) |
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{ |
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unsigned int xlen; |
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|
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HMAC_CTX *hctx = &ctx->hctx; |
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|
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HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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len - sizeof (hmac_packet)); |
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HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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} |
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|
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void |
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hmac_packet::hmac_set (crypto_ctx *ctx) |
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{ |
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hmac_gen (ctx); |
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|
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memcpy (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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bool |
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hmac_packet::hmac_chk (crypto_ctx *ctx) |
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{ |
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hmac_gen (ctx); |
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|
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return !memcmp (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
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{ |
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type = type_; |
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|
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int src = THISNODE->id; |
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|
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src1 = src; |
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srcdst = ((src >> 8) << 4) | (dst >> 8); |
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dst1 = dst; |
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} |
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|
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#define MAXVPNDATA (MAX_MTU - 6 - 6) |
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#define DATAHDR (sizeof (u32) + RAND_SIZE) |
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|
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struct vpndata_packet : vpn_packet |
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{ |
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u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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|
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void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
322 |
tap_packet *unpack (connection *conn, u32 &seqno); |
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private: |
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|
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const u32 data_hdr_size () const |
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{ |
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return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
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} |
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}; |
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|
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void |
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vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
333 |
{ |
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EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
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int outl = 0, outl2; |
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ptype type = PT_DATA_UNCOMPRESSED; |
337 |
|
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#if ENABLE_COMPRESSION |
339 |
u8 cdata[MAX_MTU]; |
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|
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if (conn->features & ENABLE_COMPRESSION) |
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{ |
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u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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|
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if (cl) |
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{ |
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type = PT_DATA_COMPRESSED; |
348 |
d = cdata; |
349 |
l = cl + 2; |
350 |
|
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d[0] = cl >> 8; |
352 |
d[1] = cl; |
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} |
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} |
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#endif |
356 |
|
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require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
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|
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struct { |
360 |
#if RAND_SIZE |
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u8 rnd[RAND_SIZE]; |
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#endif |
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u32 seqno; |
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} datahdr; |
365 |
|
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datahdr.seqno = ntohl (seqno); |
367 |
#if RAND_SIZE |
368 |
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
369 |
#endif |
370 |
|
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require (EVP_EncryptUpdate (cctx, |
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(unsigned char *) data + outl, &outl2, |
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(unsigned char *) &datahdr, DATAHDR)); |
374 |
outl += outl2; |
375 |
|
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require (EVP_EncryptUpdate (cctx, |
377 |
(unsigned char *) data + outl, &outl2, |
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(unsigned char *) d, l)); |
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outl += outl2; |
380 |
|
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require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
382 |
outl += outl2; |
383 |
|
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len = outl + data_hdr_size (); |
385 |
|
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set_hdr (type, dst); |
387 |
|
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hmac_set (conn->octx); |
389 |
} |
390 |
|
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tap_packet * |
392 |
vpndata_packet::unpack (connection *conn, u32 &seqno) |
393 |
{ |
394 |
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
395 |
int outl = 0, outl2; |
396 |
tap_packet *p = new tap_packet; |
397 |
u8 *d; |
398 |
u32 l = len - data_hdr_size (); |
399 |
|
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require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
401 |
|
402 |
#if ENABLE_COMPRESSION |
403 |
u8 cdata[MAX_MTU]; |
404 |
|
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if (type == PT_DATA_COMPRESSED) |
406 |
d = cdata; |
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else |
408 |
#endif |
409 |
d = &(*p)[6 + 6 - DATAHDR]; |
410 |
|
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/* this overwrites part of the src mac, but we fix that later */ |
412 |
require (EVP_DecryptUpdate (cctx, |
413 |
d, &outl2, |
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(unsigned char *)&data, len - data_hdr_size ())); |
415 |
outl += outl2; |
416 |
|
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require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
418 |
outl += outl2; |
419 |
|
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seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
421 |
|
422 |
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
423 |
id2mac (src (), p->src); |
424 |
|
425 |
#if ENABLE_COMPRESSION |
426 |
if (type == PT_DATA_COMPRESSED) |
427 |
{ |
428 |
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
429 |
|
430 |
p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
431 |
&(*p)[6 + 6], MAX_MTU) |
432 |
+ 6 + 6; |
433 |
} |
434 |
else |
435 |
p->len = outl + (6 + 6 - DATAHDR); |
436 |
#endif |
437 |
|
438 |
return p; |
439 |
} |
440 |
|
441 |
struct ping_packet : vpn_packet |
442 |
{ |
443 |
void setup (int dst, ptype type) |
444 |
{ |
445 |
set_hdr (type, dst); |
446 |
len = sizeof (*this) - sizeof (net_packet); |
447 |
} |
448 |
}; |
449 |
|
450 |
struct config_packet : vpn_packet |
451 |
{ |
452 |
// actually, hmaclen cannot be checked because the hmac |
453 |
// field comes before this data, so peers with other |
454 |
// hmacs simply will not work. |
455 |
u8 prot_major, prot_minor, randsize, hmaclen; |
456 |
u8 flags, challengelen, features, pad3; |
457 |
u32 cipher_nid, digest_nid, hmac_nid; |
458 |
|
459 |
void setup (ptype type, int dst); |
460 |
bool chk_config () const; |
461 |
|
462 |
static u8 get_features () |
463 |
{ |
464 |
u8 f = 0; |
465 |
#if ENABLE_COMPRESSION |
466 |
f |= FEATURE_COMPRESSION; |
467 |
#endif |
468 |
#if ENABLE_ROHC |
469 |
f |= FEATURE_ROHC; |
470 |
#endif |
471 |
return f; |
472 |
} |
473 |
}; |
474 |
|
475 |
void config_packet::setup (ptype type, int dst) |
476 |
{ |
477 |
prot_major = PROTOCOL_MAJOR; |
478 |
prot_minor = PROTOCOL_MINOR; |
479 |
randsize = RAND_SIZE; |
480 |
hmaclen = HMACLENGTH; |
481 |
flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
482 |
challengelen = sizeof (rsachallenge); |
483 |
features = get_features (); |
484 |
|
485 |
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
486 |
digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
487 |
hmac_nid = htonl (EVP_MD_type (DIGEST)); |
488 |
|
489 |
len = sizeof (*this) - sizeof (net_packet); |
490 |
set_hdr (type, dst); |
491 |
} |
492 |
|
493 |
bool config_packet::chk_config () const |
494 |
{ |
495 |
if (prot_major != PROTOCOL_MAJOR) |
496 |
slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
497 |
else if (randsize != RAND_SIZE) |
498 |
slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
499 |
else if (hmaclen != HMACLENGTH) |
500 |
slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
501 |
#if 0 // this implementation should handle all flag settings |
502 |
else if (flags != curflags ()) |
503 |
slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
504 |
#endif |
505 |
else if (challengelen != sizeof (rsachallenge)) |
506 |
slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
507 |
else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 |
slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 |
else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
510 |
slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
511 |
else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
512 |
slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
513 |
else |
514 |
return true; |
515 |
|
516 |
return false; |
517 |
} |
518 |
|
519 |
struct auth_req_packet : config_packet |
520 |
{ |
521 |
char magic[8]; |
522 |
u8 initiate; // false if this is just an automatic reply |
523 |
u8 protocols; // supported protocols (will be patched on forward) |
524 |
u8 pad2, pad3; |
525 |
rsaid id; |
526 |
rsaencrdata encr; |
527 |
|
528 |
auth_req_packet (int dst, bool initiate_, u8 protocols_) |
529 |
{ |
530 |
config_packet::setup (PT_AUTH_REQ, dst); |
531 |
strncpy (magic, MAGIC, 8); |
532 |
initiate = !!initiate_; |
533 |
protocols = protocols_; |
534 |
|
535 |
len = sizeof (*this) - sizeof (net_packet); |
536 |
} |
537 |
}; |
538 |
|
539 |
struct auth_res_packet : config_packet |
540 |
{ |
541 |
rsaid id; |
542 |
u8 pad1, pad2, pad3; |
543 |
u8 response_len; // encrypted length |
544 |
rsaresponse response; |
545 |
|
546 |
auth_res_packet (int dst) |
547 |
{ |
548 |
config_packet::setup (PT_AUTH_RES, dst); |
549 |
|
550 |
len = sizeof (*this) - sizeof (net_packet); |
551 |
} |
552 |
}; |
553 |
|
554 |
struct connect_req_packet : vpn_packet |
555 |
{ |
556 |
u8 id, protocols; |
557 |
u8 pad1, pad2; |
558 |
|
559 |
connect_req_packet (int dst, int id_, u8 protocols_) |
560 |
: id(id_) |
561 |
, protocols(protocols_) |
562 |
{ |
563 |
set_hdr (PT_CONNECT_REQ, dst); |
564 |
len = sizeof (*this) - sizeof (net_packet); |
565 |
} |
566 |
}; |
567 |
|
568 |
struct connect_info_packet : vpn_packet |
569 |
{ |
570 |
u8 id, protocols; |
571 |
u8 pad1, pad2; |
572 |
sockinfo si; |
573 |
|
574 |
connect_info_packet (int dst, int id_, const sockinfo &si_, u8 protocols_) |
575 |
: id(id_) |
576 |
, protocols(protocols_) |
577 |
, si(si_) |
578 |
{ |
579 |
set_hdr (PT_CONNECT_INFO, dst); |
580 |
|
581 |
len = sizeof (*this) - sizeof (net_packet); |
582 |
} |
583 |
}; |
584 |
|
585 |
///////////////////////////////////////////////////////////////////////////// |
586 |
|
587 |
void |
588 |
connection::connection_established () |
589 |
{ |
590 |
if (ictx && octx) |
591 |
{ |
592 |
connectmode = conf->connectmode; |
593 |
|
594 |
// make sure rekeying timeouts are slightly asymmetric |
595 |
rekey.start (NOW + ::conf.rekey |
596 |
+ (conf->id > THISNODE->id ? 10 : 0)); |
597 |
keepalive.start (NOW + ::conf.keepalive); |
598 |
|
599 |
// send queued packets |
600 |
if (ictx && octx) |
601 |
{ |
602 |
while (tap_packet *p = (tap_packet *)data_queue.get ()) |
603 |
{ |
604 |
send_data_packet (p); |
605 |
delete p; |
606 |
} |
607 |
|
608 |
while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
609 |
{ |
610 |
send_vpn_packet (p, si, IPTOS_RELIABILITY); |
611 |
delete p; |
612 |
} |
613 |
} |
614 |
} |
615 |
else |
616 |
{ |
617 |
retry_cnt = 0; |
618 |
establish_connection.start (NOW + 5); |
619 |
keepalive.stop (); |
620 |
rekey.stop (); |
621 |
} |
622 |
} |
623 |
|
624 |
void |
625 |
connection::reset_si () |
626 |
{ |
627 |
protocol = best_protocol (THISNODE->protocols & conf->protocols); |
628 |
|
629 |
// mask out protocols we cannot establish |
630 |
if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
631 |
if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
632 |
if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
633 |
|
634 |
si.set (conf, protocol); |
635 |
} |
636 |
|
637 |
// ensure sockinfo is valid, forward if necessary |
638 |
const sockinfo & |
639 |
connection::forward_si (const sockinfo &si) const |
640 |
{ |
641 |
if (!si.valid ()) |
642 |
{ |
643 |
connection *r = vpn->find_router (); |
644 |
|
645 |
if (r) |
646 |
{ |
647 |
slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
648 |
conf->nodename, r->conf->nodename); |
649 |
return r->si; |
650 |
} |
651 |
else |
652 |
slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
653 |
conf->nodename); |
654 |
} |
655 |
|
656 |
return si; |
657 |
} |
658 |
|
659 |
void |
660 |
connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
661 |
{ |
662 |
bool ok; |
663 |
|
664 |
switch (si.prot) |
665 |
{ |
666 |
case PROT_IPv4: |
667 |
ok = vpn->send_ipv4_packet (pkt, si, tos); break; |
668 |
case PROT_UDPv4: |
669 |
ok = vpn->send_udpv4_packet (pkt, si, tos); break; |
670 |
#if ENABLE_TCP |
671 |
case PROT_TCPv4: |
672 |
ok = vpn->send_tcpv4_packet (pkt, si, tos); break; |
673 |
#endif |
674 |
#if ENABLE_ICMP |
675 |
case PROT_ICMPv4: |
676 |
ok = vpn->send_icmpv4_packet (pkt, si, tos); break; |
677 |
#endif |
678 |
#if ENABLE_DNS |
679 |
case PROT_DNSv4: |
680 |
ok = send_dnsv4_packet (pkt, si, tos); break; |
681 |
#endif |
682 |
|
683 |
default: |
684 |
slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
685 |
ok = false; |
686 |
} |
687 |
|
688 |
if (!ok) |
689 |
reset_connection (); |
690 |
} |
691 |
|
692 |
void |
693 |
connection::send_ping (const sockinfo &si, u8 pong) |
694 |
{ |
695 |
ping_packet *pkt = new ping_packet; |
696 |
|
697 |
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
698 |
send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
699 |
|
700 |
delete pkt; |
701 |
} |
702 |
|
703 |
void |
704 |
connection::send_reset (const sockinfo &si) |
705 |
{ |
706 |
if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
707 |
{ |
708 |
config_packet *pkt = new config_packet; |
709 |
|
710 |
pkt->setup (vpn_packet::PT_RESET, conf->id); |
711 |
send_vpn_packet (pkt, si, IPTOS_MINCOST); |
712 |
|
713 |
delete pkt; |
714 |
} |
715 |
} |
716 |
|
717 |
void |
718 |
connection::send_auth_request (const sockinfo &si, bool initiate) |
719 |
{ |
720 |
auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
721 |
|
722 |
rsachallenge chg; |
723 |
rsa_cache.gen (pkt->id, chg); |
724 |
rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
725 |
|
726 |
slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
727 |
|
728 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
729 |
|
730 |
delete pkt; |
731 |
} |
732 |
|
733 |
void |
734 |
connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
735 |
{ |
736 |
auth_res_packet *pkt = new auth_res_packet (conf->id); |
737 |
|
738 |
pkt->id = id; |
739 |
|
740 |
rsa_hash (id, chg, pkt->response); |
741 |
|
742 |
pkt->hmac_set (octx); |
743 |
|
744 |
slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
745 |
|
746 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
747 |
|
748 |
delete pkt; |
749 |
} |
750 |
|
751 |
void |
752 |
connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
753 |
{ |
754 |
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
755 |
conf->id, rid, (const char *)rsi); |
756 |
|
757 |
connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
758 |
|
759 |
r->hmac_set (octx); |
760 |
send_vpn_packet (r, si); |
761 |
|
762 |
delete r; |
763 |
} |
764 |
|
765 |
void |
766 |
connection::establish_connection_cb (time_watcher &w) |
767 |
{ |
768 |
if (!ictx |
769 |
&& conf != THISNODE |
770 |
&& connectmode != conf_node::C_NEVER |
771 |
&& connectmode != conf_node::C_DISABLED |
772 |
&& NOW > w.at) |
773 |
{ |
774 |
double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
775 |
|
776 |
if (retry_int < conf->max_retry) |
777 |
retry_cnt++; |
778 |
else |
779 |
retry_int = conf->max_retry; |
780 |
|
781 |
w.start (NOW + retry_int); |
782 |
|
783 |
reset_si (); |
784 |
|
785 |
if (si.prot && !si.host) |
786 |
vpn->send_connect_request (conf->id); |
787 |
else |
788 |
{ |
789 |
const sockinfo &dsi = forward_si (si); |
790 |
|
791 |
if (dsi.valid () && auth_rate_limiter.can (dsi)) |
792 |
{ |
793 |
if (retry_cnt < 4) |
794 |
send_auth_request (dsi, true); |
795 |
else |
796 |
send_ping (dsi, 0); |
797 |
} |
798 |
} |
799 |
} |
800 |
} |
801 |
|
802 |
void |
803 |
connection::reset_connection () |
804 |
{ |
805 |
if (ictx && octx) |
806 |
{ |
807 |
slog (L_INFO, _("%s(%s): connection lost"), |
808 |
conf->nodename, (const char *)si); |
809 |
|
810 |
if (::conf.script_node_down) |
811 |
run_script (run_script_cb (this, &connection::script_node_down), false); |
812 |
} |
813 |
|
814 |
delete ictx; ictx = 0; |
815 |
delete octx; octx = 0; |
816 |
|
817 |
si.host = 0; |
818 |
|
819 |
last_activity = 0; |
820 |
retry_cnt = 0; |
821 |
|
822 |
rekey.stop (); |
823 |
keepalive.stop (); |
824 |
establish_connection.stop (); |
825 |
} |
826 |
|
827 |
void |
828 |
connection::shutdown () |
829 |
{ |
830 |
if (ictx && octx) |
831 |
send_reset (si); |
832 |
|
833 |
reset_connection (); |
834 |
} |
835 |
|
836 |
void |
837 |
connection::rekey_cb (time_watcher &w) |
838 |
{ |
839 |
reset_connection (); |
840 |
establish_connection (); |
841 |
} |
842 |
|
843 |
void |
844 |
connection::send_data_packet (tap_packet *pkt) |
845 |
{ |
846 |
vpndata_packet *p = new vpndata_packet; |
847 |
int tos = 0; |
848 |
|
849 |
// I am not hilarious about peeking into packets, but so be it. |
850 |
if (conf->inherit_tos && pkt->is_ipv4 ()) |
851 |
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
852 |
|
853 |
p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
854 |
send_vpn_packet (p, si, tos); |
855 |
|
856 |
delete p; |
857 |
|
858 |
if (oseqno > MAX_SEQNO) |
859 |
rekey (); |
860 |
} |
861 |
|
862 |
void |
863 |
connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
864 |
{ |
865 |
if (ictx && octx) |
866 |
send_data_packet (pkt); |
867 |
else |
868 |
{ |
869 |
if (!broadcast)//DDDD |
870 |
data_queue.put (new tap_packet (*pkt)); |
871 |
|
872 |
establish_connection (); |
873 |
} |
874 |
} |
875 |
|
876 |
void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
877 |
{ |
878 |
if (ictx && octx) |
879 |
send_vpn_packet (pkt, si, tos); |
880 |
else |
881 |
{ |
882 |
vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
883 |
|
884 |
establish_connection (); |
885 |
} |
886 |
} |
887 |
|
888 |
void |
889 |
connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
890 |
{ |
891 |
last_activity = NOW; |
892 |
|
893 |
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
894 |
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
895 |
|
896 |
switch (pkt->typ ()) |
897 |
{ |
898 |
case vpn_packet::PT_PING: |
899 |
// we send pings instead of auth packets after some retries, |
900 |
// so reset the retry counter and establish a connection |
901 |
// when we receive a ping. |
902 |
if (!ictx) |
903 |
{ |
904 |
if (auth_rate_limiter.can (rsi)) |
905 |
send_auth_request (rsi, true); |
906 |
} |
907 |
else |
908 |
send_ping (rsi, 1); // pong |
909 |
|
910 |
break; |
911 |
|
912 |
case vpn_packet::PT_PONG: |
913 |
break; |
914 |
|
915 |
case vpn_packet::PT_RESET: |
916 |
{ |
917 |
reset_connection (); |
918 |
|
919 |
config_packet *p = (config_packet *) pkt; |
920 |
|
921 |
if (!p->chk_config ()) |
922 |
{ |
923 |
slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
924 |
conf->nodename, (const char *)rsi); |
925 |
connectmode = conf_node::C_DISABLED; |
926 |
} |
927 |
else if (connectmode == conf_node::C_ALWAYS) |
928 |
establish_connection (); |
929 |
} |
930 |
break; |
931 |
|
932 |
case vpn_packet::PT_AUTH_REQ: |
933 |
if (auth_rate_limiter.can (rsi)) |
934 |
{ |
935 |
auth_req_packet *p = (auth_req_packet *) pkt; |
936 |
|
937 |
slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
938 |
|
939 |
if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
940 |
{ |
941 |
if (p->prot_minor != PROTOCOL_MINOR) |
942 |
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
943 |
conf->nodename, (const char *)rsi, |
944 |
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
945 |
|
946 |
if (p->initiate) |
947 |
send_auth_request (rsi, false); |
948 |
|
949 |
rsachallenge k; |
950 |
|
951 |
if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
952 |
{ |
953 |
slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
954 |
conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
955 |
break; |
956 |
} |
957 |
else |
958 |
{ |
959 |
delete octx; |
960 |
|
961 |
octx = new crypto_ctx (k, 1); |
962 |
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
963 |
|
964 |
// compatibility code, remove when no longer required |
965 |
if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
966 |
|
967 |
conf->protocols = p->protocols; |
968 |
features = p->features & config_packet::get_features (); |
969 |
|
970 |
send_auth_response (rsi, p->id, k); |
971 |
|
972 |
connection_established (); |
973 |
|
974 |
break; |
975 |
} |
976 |
} |
977 |
else |
978 |
slog (L_WARN, _("%s(%s): protocol mismatch"), |
979 |
conf->nodename, (const char *)rsi); |
980 |
|
981 |
send_reset (rsi); |
982 |
} |
983 |
|
984 |
break; |
985 |
|
986 |
case vpn_packet::PT_AUTH_RES: |
987 |
{ |
988 |
auth_res_packet *p = (auth_res_packet *) pkt; |
989 |
|
990 |
slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
991 |
|
992 |
if (p->chk_config ()) |
993 |
{ |
994 |
if (p->prot_minor != PROTOCOL_MINOR) |
995 |
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
996 |
conf->nodename, (const char *)rsi, |
997 |
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
998 |
|
999 |
rsachallenge chg; |
1000 |
|
1001 |
if (!rsa_cache.find (p->id, chg)) |
1002 |
{ |
1003 |
slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1004 |
conf->nodename, (const char *)rsi); |
1005 |
break; |
1006 |
} |
1007 |
else |
1008 |
{ |
1009 |
crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1010 |
|
1011 |
if (!p->hmac_chk (cctx)) |
1012 |
{ |
1013 |
slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1014 |
"could be an attack, or just corruption or a synchronization error"), |
1015 |
conf->nodename, (const char *)rsi); |
1016 |
break; |
1017 |
} |
1018 |
else |
1019 |
{ |
1020 |
rsaresponse h; |
1021 |
|
1022 |
rsa_hash (p->id, chg, h); |
1023 |
|
1024 |
if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
1025 |
{ |
1026 |
prot_minor = p->prot_minor; |
1027 |
|
1028 |
delete ictx; ictx = cctx; |
1029 |
|
1030 |
iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1031 |
|
1032 |
si = rsi; |
1033 |
protocol = rsi.prot; |
1034 |
|
1035 |
connection_established (); |
1036 |
|
1037 |
slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1038 |
conf->nodename, (const char *)rsi, |
1039 |
p->prot_major, p->prot_minor); |
1040 |
|
1041 |
if (::conf.script_node_up) |
1042 |
run_script (run_script_cb (this, &connection::script_node_up), false); |
1043 |
|
1044 |
break; |
1045 |
} |
1046 |
else |
1047 |
slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1048 |
conf->nodename, (const char *)rsi); |
1049 |
} |
1050 |
|
1051 |
delete cctx; |
1052 |
} |
1053 |
} |
1054 |
} |
1055 |
|
1056 |
send_reset (rsi); |
1057 |
break; |
1058 |
|
1059 |
case vpn_packet::PT_DATA_COMPRESSED: |
1060 |
#if !ENABLE_COMPRESSION |
1061 |
send_reset (rsi); |
1062 |
break; |
1063 |
#endif |
1064 |
|
1065 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
1066 |
|
1067 |
if (ictx && octx) |
1068 |
{ |
1069 |
vpndata_packet *p = (vpndata_packet *)pkt; |
1070 |
|
1071 |
if (!p->hmac_chk (ictx)) |
1072 |
slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1073 |
"could be an attack, or just corruption or a synchronization error"), |
1074 |
conf->nodename, (const char *)rsi); |
1075 |
else |
1076 |
{ |
1077 |
u32 seqno; |
1078 |
tap_packet *d = p->unpack (this, seqno); |
1079 |
|
1080 |
if (iseqno.recv_ok (seqno)) |
1081 |
{ |
1082 |
vpn->tap->send (d); |
1083 |
|
1084 |
if (si != rsi) |
1085 |
{ |
1086 |
// fast re-sync on connection changes, useful especially for tcp/ip |
1087 |
si = rsi; |
1088 |
|
1089 |
slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1090 |
conf->nodename, (const char *)si, (const char *)rsi); |
1091 |
} |
1092 |
} |
1093 |
|
1094 |
delete d; |
1095 |
break; |
1096 |
} |
1097 |
} |
1098 |
|
1099 |
send_reset (rsi); |
1100 |
break; |
1101 |
|
1102 |
case vpn_packet::PT_CONNECT_REQ: |
1103 |
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1104 |
{ |
1105 |
connect_req_packet *p = (connect_req_packet *) pkt; |
1106 |
|
1107 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1108 |
connection *c = vpn->conns[p->id - 1]; |
1109 |
conf->protocols = p->protocols; |
1110 |
|
1111 |
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1112 |
conf->id, p->id, c->ictx && c->octx); |
1113 |
|
1114 |
if (c->ictx && c->octx) |
1115 |
{ |
1116 |
// send connect_info packets to both sides, in case one is |
1117 |
// behind a nat firewall (or both ;) |
1118 |
c->send_connect_info (conf->id, si, conf->protocols); |
1119 |
send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1120 |
} |
1121 |
else |
1122 |
c->establish_connection (); |
1123 |
} |
1124 |
|
1125 |
break; |
1126 |
|
1127 |
case vpn_packet::PT_CONNECT_INFO: |
1128 |
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1129 |
{ |
1130 |
connect_info_packet *p = (connect_info_packet *)pkt; |
1131 |
|
1132 |
if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1133 |
{ |
1134 |
connection *c = vpn->conns[p->id - 1]; |
1135 |
|
1136 |
c->conf->protocols = p->protocols; |
1137 |
protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1138 |
p->si.upgrade_protocol (protocol, c->conf); |
1139 |
|
1140 |
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1141 |
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1142 |
|
1143 |
const sockinfo &dsi = forward_si (p->si); |
1144 |
|
1145 |
if (dsi.valid ()) |
1146 |
c->send_auth_request (dsi, true); |
1147 |
} |
1148 |
} |
1149 |
|
1150 |
break; |
1151 |
|
1152 |
default: |
1153 |
send_reset (rsi); |
1154 |
break; |
1155 |
} |
1156 |
} |
1157 |
|
1158 |
void connection::keepalive_cb (time_watcher &w) |
1159 |
{ |
1160 |
if (NOW >= last_activity + ::conf.keepalive + 30) |
1161 |
{ |
1162 |
reset_connection (); |
1163 |
establish_connection (); |
1164 |
} |
1165 |
else if (NOW < last_activity + ::conf.keepalive) |
1166 |
w.start (last_activity + ::conf.keepalive); |
1167 |
else if (conf->connectmode != conf_node::C_ONDEMAND |
1168 |
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1169 |
{ |
1170 |
send_ping (si); |
1171 |
w.start (NOW + 5); |
1172 |
} |
1173 |
else if (NOW < last_activity + ::conf.keepalive + 10) |
1174 |
// hold ondemand connections implicitly a few seconds longer |
1175 |
// should delete octx, though, or something like that ;) |
1176 |
w.start (last_activity + ::conf.keepalive + 10); |
1177 |
else |
1178 |
reset_connection (); |
1179 |
} |
1180 |
|
1181 |
void connection::send_connect_request (int id) |
1182 |
{ |
1183 |
connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1184 |
|
1185 |
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1186 |
p->hmac_set (octx); |
1187 |
send_vpn_packet (p, si); |
1188 |
|
1189 |
delete p; |
1190 |
} |
1191 |
|
1192 |
void connection::script_node () |
1193 |
{ |
1194 |
vpn->script_if_up (); |
1195 |
|
1196 |
char *env; |
1197 |
asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1198 |
asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1199 |
asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1200 |
asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1201 |
} |
1202 |
|
1203 |
const char *connection::script_node_up () |
1204 |
{ |
1205 |
script_node (); |
1206 |
|
1207 |
putenv ("STATE=up"); |
1208 |
|
1209 |
return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1210 |
} |
1211 |
|
1212 |
const char *connection::script_node_down () |
1213 |
{ |
1214 |
script_node (); |
1215 |
|
1216 |
putenv ("STATE=down"); |
1217 |
|
1218 |
return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1219 |
} |
1220 |
|
1221 |
connection::connection (struct vpn *vpn, conf_node *conf) |
1222 |
: vpn(vpn), conf(conf) |
1223 |
, rekey (this, &connection::rekey_cb) |
1224 |
, keepalive (this, &connection::keepalive_cb) |
1225 |
, establish_connection (this, &connection::establish_connection_cb) |
1226 |
#if ENABLE_DNS |
1227 |
, dnsv4_tw (this, &connection::dnsv4_cb) |
1228 |
#endif |
1229 |
{ |
1230 |
octx = ictx = 0; |
1231 |
retry_cnt = 0; |
1232 |
|
1233 |
if (!conf->protocols) // make sure some protocol is enabled |
1234 |
conf->protocols = PROT_UDPv4; |
1235 |
|
1236 |
connectmode = conf_node::C_ALWAYS; // initial setting |
1237 |
reset_connection (); |
1238 |
} |
1239 |
|
1240 |
connection::~connection () |
1241 |
{ |
1242 |
shutdown (); |
1243 |
} |
1244 |
|
1245 |
void connection_init () |
1246 |
{ |
1247 |
auth_rate_limiter.clear (); |
1248 |
reset_rate_limiter.clear (); |
1249 |
} |
1250 |
|